Willy Birgel

as Robert Lennart, Dirigent

Maria Holst

as Irene Thomas

Hans Nielsen

as Martin Thomas, Fabrikant

Maximilian Schell

as Wolfgang Thomas, beider Sohn

Erni Mangold

as Maxie Mell, Kabarettistin

Heinz Reincke

as Besselmann, genannt „Muffel“, Komponist

Charles Regnier

as Boerner, Konzertmeister

Ursula Herking

as Fräulein Snyder, Lennarts Sekretärin